Oxidized resin and process of making same



Patented Apr. 1, 1930 UNITED STATES ALEXANDER S. DAMAGE, OF DETROIT, MICHIGAN OZII IDIZED RESIN AND PROCESSOR MAKING-SAME Ho-Drawlng.

This'invention is a novel product derivable from ordinary rosin or colophony by subjecting it in solution in a non-oxidizing solvent to the action of ozone or ozonized air. The invention comprises also the process of preparing the product.

I have found that if common rosin be dissolved in a suitable solvent, which is preferably a hydrocarbon of the olefin or naphthene 0 type or a mixture of such hydrocarbons, and

the solution subjected at a moderate temperature, preferably not exceeding about 200 F., to the action of ozonized air, or air which has been activated by passage through a silent electric discharge, the solution darkens and becomes progressively thicker and more viscous. Any vapors iven off during this treatment are condense and recovered, and may be utilized as explained below. The thick-' ened solution thus prepared is admirably adapted for use as a varnish, or as a paint v ehicle, and has the advantageous property, in

contradistinction to rosin, of not livermg when ground with active pigments such as red lead, zinc oxid and the like. a

The chemical constitution of the product I prepared as above has not yet been definitely determined, but inasmuch as it is made by subjecting rosin to strongly oxidizing conditions' it may be regarded as an oxidized resin and will be so termed herein. This prodnot is far less soluble than rosinin such hydrocarbons as have been mentioned above, but is freely soluble inthe aromatic hydrocarbons, benzol, toluol, xylol, etc.

The oxidized resin may be recovered from solutions or colloidal suspensions prepared as above in various ways, one convenient method being to dilute the solution with an additional amount of the original solvent, or better with the condensed volatile product recovered during the oxidizing treatment. The oxidized resin is thereby precipitated, and .the supernatant liquid may be run oil and used to dissolve 'fresh'rosin for a repetition of the'o eration. The last ortions of the solvent m y be eliminated y gentle heating in a current of air, by steaming, or by other appropriate methods. A a

To further purify the oxidized resin I pre- Application filed January 12, 1926. vSerial No. 80,827.

Mean saponification equivferto dissolve the precipitate prepared as above in benzol, and then to re-precipitate it in the cold with a paraflin, olefin or naphthene hydrocarbon or a mixture of these. The oxidized resin is thereby thrown down as a dense precipitate, which after filtering, washing with the precipitating hydrocarbon and drying at low temperature, is recovered as a light-brown powder, melting at about 250 F. to a resinous mass.

The properties of the product will of course depend to some extent upon the duration and intensity of the oxidizing treatment to which it has been subjected, but in all cases these properties differ widely from those of the -original rosin. A comparison of certain of these properties in a typical case is as follows:

187 30 Insoluble. Insoluble. Soluble. Soluble. Soluble. Soluble. Insoluble. Not very soluble. Not very soluble. Practically insoluble. Soluble. Practically insoluble.

Iodln number";

KOH required--- ns Carbon tetrachloride Alcohol Ether Turpentine Hot linseed oil A further and striking distinction between rosin and the oxidized resin is that whereas the metallic salts of the former, the so-called v rosin soaps, are readily soluble in all common neutral solvents, such as those mentioned 1 above, the corresponding salts or soaps of the oxidized resin are substantially insoluble in these solvents.

The hereindescribed oxidized resin is applicable for a wide Variety of uses, including not only varnishes and paints as noted above, but in admixture with suitable fillers for plastic molding.-

I claim: v

1. Process of making an oxidized resin, comprising subjecting colophony i'nsolution in'a liquid hydrocarbon to the action of ozonized air, the solvent being a non-aromatic h drocarbon in which the-oxidized resin is Suhstantially insoluble. e

2. An d'xidized resin prepared by subjecting colophony in solution in a liquid hydrocarbon to the action of ozonized air, the solvent being a non-aromatic h drocarbonin whichthe oxidized resin is su stantially insoluble, said oxidized resin having as compared'with colophony, a low iodin number and saponifioation equivalent,' a lesser degree of solubility in most neutral solvents, and forming soaps of relatively slight solubility in said solvents.

In testimony whereof, I aflix my signature.

ALEXANDER S. RAMAGE. 

